Interlocking and zeroizing mechanism



1943. J. c. WOODFORD IETAL 2,336,381

INTERLOCKING AND ZEROIZING MECHANISM Filed Jan. 26, 1942 2 Sheets-Sheet l FIZZ 1- //V l/E/V TOQS: JOSfP/l C Woooroeo,

, JOSfP/f 5. Emmy,

. 7, 1943. J. c. WOODFORD :1 AL 2,336,331

INTERLOC KING AND ZEROIZING MECHANISM Filed Jan. 26. 1942 g s t s t 2 Patented Dec. 7, 1943 INTERLOCKING AND ZEROIZING MECHANISM Joseph 0. Woodford, S

Fernly,

pring Lake, and Joseph E. Muskegon Heights, Mich., assignors to John Wood Manufacturing Company, Inc., Philadelphia, Pa., a corporation of Delaware Application January 26, 1942, Serial No. 428,332

10 Claims.

Our invention relates to interlock mechanism particularly applicable for use in visible registers of the types used in fluid dispensing pumps. Our improved interlock mechanism is adapted to be operatively connected to the resetting shaft of the visible register and is connected in controlling relation to the motor switch of the pump motor. Our invention also includes mechanism necessitating the zeroizing of the visible register before the motor switch can be moved to closed position.

One object of our invention is to provide an interlock which is simple and inexpensive to manufacture.

Another object of our invention is to provide an interlock for the purpose of protecting the mechanical parts of the meter and register drive shafts and gears by preventing the register being set back to zero while the motor is running.

Another object of our invention is to provide an interlock which prevents the motor switch being closed while the register is only partially set back, during which condition the register drive is locked.

Another object of our invention is to provide an interlock which necessitates the resetting of the register to zero position before the motor switch can be moved to closed position.

Although we have shown our invention embodied in a visible register of the type in which there is visible indication only of the volume of fluid dispensed, it is obvious that our invention also may be readily embodied in indicating mechanism of the type in which not only the volume of fluid dispensed, but also the dollar value thereof, is visibly indicated on a series of dials. Such a form of indicating mechanism is shown in the application of David S. Willson, Serial No. 416,600 filed October 25, 1941, which Willson application is assigned to the same assignee as our invention.

Our invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

Fig. I is a side elevation of a visible register embodying our interlocking and zeroizing mechanism, with the outer casing of said register shown in section. The interlocking and zeroizing structure is shown in the position which it assumes when the motor switch is ofi and the register wheels in zero position.

Fig. II is a. fragmentary plan view of the structure shown in Fig. I, but limited to the interlocking and zeroizing structure.

Fig. III is a side elevation of the interlocking and zeroizing mechanism shown in Fig. I, with the parts of such mechanism shown in the position which they assume when the motor switch has been moved to on position.

Fig. IV is a side elevation of the interlocking and zeroizing mechanism shown in Fig. I, with the parts of such mechanism shown in the position which they assume when the motor switch has been moved to o position, but before the register wheels have been reset to zero.

Fig. V is a side elevation of the interlocking and zeroizing mechanism shown in Fig. I, with the parts of such mechanism shown in the position which they assume when the motor switch is off and the indicating wheels of the visible register partly reset toward zero position.

Fig. VI is a side elevation of a modified form of our invention in which the cam engaging means is carried by an extension arm formed on the lock cam.

Referring particularly to Fig. I of said drawings, the registering mechanism indicated is of the well-known conventional type, such as are manufactured by Veeder-Root Incorporated, including a plurality of indicia wheels I which are provided with gear wheels in engagement with conventional tens-transfer pinions in the wellknown manner as is known to those skilled in the art, the indicia wheels in counters of this well known type are free to turn upon their reset shaft when the indicia wheels are driven in their registering direction of rotation and said indicia wheels are reset to zero position by rotation of said reset shaft. Said wheels I are journaled on their setback, reset, shaft 2 Which is conveniently journaled in opposite bearings 3, which have reduced portions press-fitted respectively into opposite side wall members 5, one of which is shown in dotted lines in Fig. II. Said registering mechanism is conveniently enclosed in the housing 1, including the bottom closure 8, middle section 9, and top closure l0. Said middle section 9 is provided at the front thereof with a glass enclosed opening l2 permitting the indicia wheels to be visible through a series of apertures I3 formed in the register cover plate M which is conveniently held in position by a series of screws l6 engaging brackets connected to the side frame members 5.

Said registering mechanism includes the gear 20 adapted for engagement with the driving gear of any of the well-known types of fluid meters. Said gear 20 is conveniently fastened by means of the pin 2| to the shaft 22 which is journaled in the bottom closure 8. Said shaft 22 carries at its upper end the gear 23 rigidly secured thereon and in driving connection with the gear 25 mounted on the shaft 26, which is journaled at its lower and upper ends respectively in the closure plate 8 and a cross supporting frame member 27. Said member 21 is supported by the side frame members and conveniently fastened thereto by means of a series of screws in the downwardly turned flange 29 of said cross bar 2?.

Said shaft 25 carries, intermediate of its length, the helical gear 38 which is fastened to said shaft 28, conveniently by mean of the pin 3| in the hub 38' of said gear 38. Said gear 38 is in engagement with the gear 32 fastened to the shaft 33, the axis of which is at right angles to the axis of said shaft 26. Said shaft 33 is conveniently journaled in said side wall members 5. Said shaft 33 carries at its right hand end the gear 35 in engagement with the' idle gear 36. Said gear 36 is conveniently mounted for freedom of turning movement on the stud shaft 31 mounted in the side wall bracket 5, as shown in Fi I. The gear 36 is in engagement with the gear 38 carried by the indicia wheel of lowest order, which is the indicia wheel shown in Fig. I. Said shaft 33 is provided with a clutch of any of the well-known types to permit disengagement of the driving connection between the gear 32 and the gear 35 during the resetting operation of the counter.

The shaft 2 has mounted at the right hand end thereof the disk cam 48 provided with the hub 4!. Said cam 48 is provided with the cam notch 42 for engagement with the reset arm roller 88 which is mounted to turn freely on its rivet stud 44 rigidly mounted in the bell crank reset arm member 48. Said reset arm member 46 is pivotally mounted on the screw shaft 81 which is rigidly mounted in the side frame member 5. Said reset arm member 45 is continually stressed clockwise by the spring 58, one end of which encircles the stud 5i rigidly mounted on said reset arm member 45 and the other end of which spring encircles the screw stud 53 which is fastened to said side frame member 5.

The lock lever 68 is pivotally mounted at the end of the register reset shaft 2 as shown in Figs. I and II. Said lever 68 is prevented from axial displacement on said shaft 2 by means of the collar BI rigidly fastened on the shaft 2, conveniently by means of the set screw 93. As shown in Fig. I, said shaft 2 carries at its extreme end, in rigid relation therewith, the setback handle 65 by means of which the operator may manually turn.the reset shaft 2 to effect zeroizin movement of the plurality of indicia wheels I of the visible register.

Said lever 68 carries at its right hand end the screw stud 88 which is loosel mounted for freedom of turning movement in a drilled hole 89 formed in said lever 68. Said stud 68carries in rigid relation thereto the hinge block 18, which is rigidly secured on said stud 68 conveniently by means of the nut ll. Thus, said hinge block I8 is mounted with freedom of turning move ment in relation to the lock lever 88. The lever 68 is connected to the motor switch by means of the rod 12, the upper end of which is screw threaded and extends through a drilled opening in the hinge block I8, and said rod I2 is clamped to said hinge block in rigid relation thereto, conveniently by means of the locking nuts I5 in engagement with the screw threaded end of said rod 12. When my registering mechanism is embodied in liquid dispensing apparatus of the wellknown type, the lower end of the rod I2 is adapted to be connected to the pivoted switch lever and nozzle support, of the well known type as is commonly used in such apparatus, and said switch lever is connected by a rod to the motor switch S in the well known manner.

Said lever 88 is provided, intermediate of its opposite ends, with the eccentric stud 11 which is screw threaded at its outer end and mounted in rigid relation to said lever 88 by means of the nut I8.

The lock cam 88 is mounted with freedom of turning movement on the stud 8| which is rigidly mounted in the lock cam bracket 83, conveniently by riveting over the end of said stud 8| in said bracket 83; Said bracket 83 is rigidly mounted on the housing bottom closure plate 8, conveniently by cap screws 85. Said lock cam 88 is provided with the stud 81 which is rigidly mounted on said lock cam 88, and the right hand end of the lock connecting link 88 is loosely pivotally mounted on said stud 81. The opposite left hand end of said lock connecting link 88 is loosely pivvotally connected to the stud 5| mounted in the bell crank reset arm 45. Said connecting link 88 is prevented from axial displacement on the stud 5I by interposing the loose washer 98 between the link 88 and the snap ring 5| on the head of the stud 5|, and said link 88 is prevented from becoming displaced axially on its stud 81 by interposing the loose washer 9| between said link 88' and the snap ring on the head of the stud 81.

The stud 93 is rigidly mounted in an offset portion at the right hand side of said lock cam 88, and the latch 95 is pivotally mounted on said stud 93. Said latch is provided at its left hand end with the upturned hook portion 96 which is adapted to engage the stud pin 91 rigidly carried by the latch 98 hereinafter described. Said latch 95 is also provided with the inclined surface 99 forming the shoulder I88 also adapted for engagement with the stud pin 91 when said latch 95 and latch 98 are in certain relative positions, as will be hereinafter described.

Said latch 95 is provided at its right hand end with the extension I8I having the opening I82 therethrough and in which is engaged the upper end of the latch spring I83.

The opposite end of said spring i 83 engages the opening I85 formed in the extension I86 of the latch 98 which is pivotally mounted with freedom of turning movement on the same stud 8| on which the lock cam 88 is mounted. Said latch and said latch 98 being connected at their respective right hand ends by the spring I83, said latch 95 is continually stressed in a clockwise direction and said latch 98 in a counterclockwise direction. counterclockwise movement of the latch 98 is limited by its stud 91 coming into engagement with the notch formed by the upturned end 96 and inclined surface 99 of the latch 95.

The upper end of said latch 98 is provided with the two arcuate notches I88 and I89 which are adapted to engage the stud TI of the lock lever 69 to prevent clockwise motor switch closing movement of the lock lever 68 when said latch 98 has assumed a certain predetermined position during the course of operation of the mechanism, as hereinafter described.

We have found it convenient to provide a stop pawl H2 for the reset cam 48. Said pawl H2 is J'ournaled on the stud I I3 rigidly mounted in the side frame member 5. Said stop pawl H2 is continually stressed clockwise by means of the spring I I 5, one end of which engagesthe arcuate surface of said pawl 2, as shown in Fig. I, and the other end of said spring H encircles and is fastened to the stud II 3. Once a resetting operation has been initiated, and the roller 43 moved out of the cam notch 42 by clockwise movement of the reset handle 65, and the cam notch 42 moved beyond the pawl I I2, any attempt to thereafter move the reset cam 48 in an improper counterclockwise direction would result in the stop pawl IIZ engaging the cam notch 42 to prevent further counterclockwise rotation of said cam 40. During normal resetting operation in which the reset handle 65 and cam 40 are turned clockwise, said stop pawl II2 rides upon the periphery of the cam 40,

Operation In describing the operation of our invention, it is to be assumed that the visible register I is mounted in a liquid dispensing apparatus with the gear in mesh with the gear on the drive shaft of the meter and with the lower end of the motor switch rod I2 connected to the pivoted switch lever and nozzle support of such apparatus and with said switch lever connected by a rod to the switch controlling the electric motor which operates the pump. Fig. I of the drawings shows our invention with the various elements of the interlock and zeroizing mechanism in the position which they assume when the visible register has been reset to zero by clockwise turning movement of the setback handle shaft 65. In such position, the zero figure on each of the wheels of the register appears in the window opening I3 of the register cover plate I4. The reset arm roller 43 is engaged in the cam notch 42 of the earn it which is rigidly mounted on the reset shaft 2. The lock cam 80 and latch 93 are in their extreme clockwise position and the lock lever 85!, including the stud I'I rigidly mounted thereon, is upheld in raised position by means of the rod 12 connected to the pivoted switch lever and nozzle support.

To eiTect a dispensing of fluid by the liquid dispensing apparatus in which our invention is designed to be embodied, the operator moves the well-known unitary pivoted switch lever and nozzle support counterclockwise, which efiects closure of the motor switch and moves the rod 12 downwardly from the position shown in Fig. I. Such downward movement of the rod I2 causes the lock lever 60 to be moved clockwise about the reset shaft 2 and brings the stud TI into contact with the left hand arcuate surface of the upturned hook portion 95 of the latch 95, thereby moving said latch 95 counterclockwise about its pivot 93. Such counterclockwise movement of the latch 95 frees the shoulder I39 of the latch 85 from detaining engagement with the stud pin 9''! of the latch 98, thereby permitting the spring I63 to move the latch 98 counterclockwise around its pivot stud 8|. counterclockwise movement of the latch 98 is limited by the left hand surface of the latch 98 coming into engagement with the stud ll rigidly mounted on the lock arm 68.

The above described clockwise movement of the lock lever 89 by downward movement of the rod '12 has brought the stud 'II, rigidly mounted on the lever 66, into the path of the lock cam 85, thereby preventing counterclockwise movement of the lock cam 80 during such time as the motor switch is in on position. Fig. III shows the position which the various elements astion as just described above.

sume when the motor switch is in closed posi- When in such position, the operator cannot turn the reset handle 65, attached to the resetting shaft 2, to effect a resetting of the numeral wheels of the visible register, because the lock cam is connected directly to the bell crank reset arm 46 by the rigid link 88 and the roller 43, also carried by the reset arm 46, is engaged in the notch 42 of the cam 40, which is rigidly mounted on the reset shaft 2. Thus, turning movement of the reset shaft 2 is prevented.

As fluid is dispensed, it is recorded by the movement of the indicia wheels I, turning upon the reset shaft held stationary, through the chain of gearing 20, 23, 25, 30, 32, 35, 35, and 38, etc., by reason of the fact that the gear 20 is engaged with the driving gear of a fluid meter through which is passing the fluid to be dispensed.

After a dispensing operation has been completed, the visible register indicating wheels I have been moved through the chain of gearin 20, 23, 25, 3, 32, 35, 36, and 38, etc., to indicate the volume of fluid dispensed by the operator. The operator then moves clockwise the switch lever and nozzle support of the liquid dispensing apparatus, either manually or by placing the nozzle upon the nozzle support, which clockwise movement of the switch lever and nozzle support causes the rod 72 to be moved upwardly to the position shown in Fig. IV of the drawings. Such upward movement of the rod I2 moves the lock lever counterclockwise about the reset shaft 2. The initial portion of such counterclockwise movement of the lock lever 60 moves the stud. 11, of the lock arm 60, out of engagement with the left hand edge of the latch 98 and permits the latch 98 to be moved counterclockwise under the effective forces of the spring I03 to bring the arcuate notch I08 of the latch 98 beneath the stud 11. Thus, even with only partial movement of the rod I2 toward motor switch off position, the operator cannot again move the switch lever toward closing position until the resetting cycle has been completed, because the arcuate notch I 08 of the latch 98 acts as an impedence in the clockwise path of travel of the stud I7 carried by the lock lever 60.

When the operator has moved the switch lever to full oif position, the various elements assume the position shown in Fig. IV. In such full motor switch off position, the latch 98 has moved farther in a counterclockwise direction to bring the surface of its arcuate notch I09 beneath the stud I! of the lock lever St, to thus prevent closure of the motor switch in the same manner as described above When during the initial movement of the latch 98 the arcuate notch I08 was presented into the clockwise path of travel of said stud TI.

The operator resets the wheels of the visible register to zero position by turning the reset handle 65 clockwise one complete revolution plus the number of degrees represented by the amount of overthrow. Clockwise turning movement of the reset handle 65 causes the cam roller 43 to move out of engagement with the notch 42 into engagement with the periphery of the cam 48, as shown in Fig. V. The operator is able to effect movement of the cam roller 43 out of its cam notch 42, because movement of the motor switch to open position has moved the stud ll of the lock lever 60 counterclockwise out of the counterclockwise path of travel of the lock cam 80.

Clockwise movement of the cam 40 causes the bell crank reset arm 46 to be moved counterclockwise about its stud 41 which thereby moves the lock cam 80, connected to the reset arm 46 by the link 88, counterclockwise to present the upper arcuate face of the lock cam 80 as an impedance, in addition to the arcuate notch I09 of the latch 98, against'any clockwise, or motor switch closing, movement of the stud H of the lock lever 68.

In resetting said counter to zero, the reset cam 49 and reset handle 65 are turned clockwise in excess of 360 to effect a proper lining up of the counter wheels of the register which is effected in the well-known manner in the reverse, or counterclockwise, movement of the reset cam 40 through the number of degrees of overthrow.

When the cam 49 reaches the point in its clockwise movement where its notch 42 is presented for engagement with the reset arm roller 13, said roller 43 enters the cam notch 42 and, upon release of said handle 65 by the operator, said reset arm 45 is moved clockwise about its pivot 47 by means of the spring 50. Such clockwise movement of the reset arm 46 under the effective forces of its spring '59 also moves clockwise the lock cam 89, which is connected directly to the reset arm 46 by the link 88. The latches 95 and 93 are also moved in a clockwise direction, because the latch 95 is pivotally mounted on the lock cam stud 93 and the latch 98 is connected to the latch 95 by the spring I03. Thus, the latch 98 and lock cam 80 are moved out of the path of travel of the stud T! of the lock lever Ell, and the left hand arcuate surface of the upturned hook arm 96 of the latch 95 is again presented in the clockwise path of travel of the stud H, with the pin stud 97 of the latch 98 in detaining engagement with the shoulder I of the latch 95. Accordingly, the zeroizing operation of the register, effected by the operator turning the reset shaft 2 by its reset handle 65, has restored the elements of our interlock and zeroizing mechanism to the positions shown in Fig. I and wherein closure of the motor switch can again be effected.

Although we have shown and described an embodiment of our invention which includes both the interlock and zeroizing features, it is obviou that the latches 95 and 98, etc., may be omitted to eliminate the compulsory zeroizing feature of our invention. In such a modified structure, the lock cam 80 would form a protective interlook only for the purpose of protecting the mechanical parts of the meter and re ister drive shafts and gears, by preventing either the register from being set back while the motor is running or the motor being started while the register only set back partially. It is to be noted that during the setback operation of a register, the register drive is locked and breakage at some point would result if an attempt is made to operate the register by the gear drive of the meter shaft.

Modified form shown in Fig. VI

In Fig. VI we have shown a modified form of our invention in which the cam engaging means is carried by an arm formed as part of the lock cam. Referring to Fig. VI, the shaft 292, equivalent to the shaft 2 shown in Figs. I to V inclusive, has mounted at the right hand end thereof the cam 24B. Said cam 24!] is provided with the cam notch 242 for engagement with the reset arm roller 243 which is mounted to turn free- 1y on its rivet stud 244 rigidly mounted in the arm member 246 which is formed as part of the lock cam 28!). Said lock cam 280 is mounted with freedom of turning movement on the stud 28! which is rigidly mounted in a lock cam bracket, as is shown in Fig. I. Said extension arm 246 and lock cam 280 are continually stressed clockwise by the spring 250, one end of which encircles the stud I mounted on said extension arm 246 and the other end of said spring encircles a screw stud fastened to the side frame member, such as is shown at 53 in Fig. I.

Thus, in the modified form of our invention, the lock cam 289 with its extension arm 246 may be substituted for the reset arm member 46, link 88, and lock cam 89 shown in Figs. I to V inclusive. It is, of course, to be understood that the other elements of our invention, as shown in Figs. I to V inclusive, such as the latch 95, latch 98, 20 spring I03, etc., are used in conjunction with the modified lock cam shown in Fig. VI, and perform the same functions ascribed to them with reference to the form of our invention shown in Figs. I to V inclusive.

Although we have described our invention with reference to the lever 60 being connected, by means of the rod 12, to a motor switch, it is obvious that our invention is adaptable for use in connection with other devices, such as control valves which are moved to open and closed positions.

Therefore, we do not desire to limit ourselves to the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of our invention, as defined in the appended claims.

We claim:

1. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; means carried by said arm for engagement in said cam notch; a pivoted lock cam; means connecting said reset arm and lock cam; a pivoted lock lever; means connecting said lock lever to a motor switch; and a stud carried by said lock lever; whereby movement of said stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch "on position; and movement of said lock cam into the path of travel of said stud prevents movement of said lock lever to motor switch on position during resetting movement of said register mechanism setback shaft.

2. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; roller means carried by said arm for engagement in said cam notch; a pivoted lock cam; link means connecting said reset arm and lock cam; a pivoted lock lever; means connecting said lock lever to a motor switch; and a stud carried by said lock lever; whereby movement of said stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position; and movement of said lock cam into the path of travel of said stud prevents movement of said lock lever to motor switch on position during resetting movement of said register mechanism setback shaft.

3. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; and a stud carried by said lock lever; whereby movement of said stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position; and movement of said lock cam into the path of travel of said stud prevents movement of said lock lever to motor switch on position during resetting movement of said register mechanism reset shaft.

4. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a spring connected to said reset arm and continually stressing said arm in a direction of rotation opposite to the direction of rotation in which said setback shaft and cam are turned manually to effect resetting to zero of said registering mechanism; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; and a stud carried by said lock lever; whereby movement of said stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position; and movement of said lock cam into the path of travel of said stud prevents movement of said lock lever to motor switch on position during resetting movement of said register mechanism setback shaft.

5. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; means carried by said arm for engagement in said cam notch; a pivoted lock cam; means connecting said reset arm and lock cam; a pivoted lock lever; means connecting said lock lever to a motor switch; a stud carried by said lock lever; a first latch pivotally mounted on said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; and spring means connecting said first and second latches; whereby movement of said lock lever stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents a movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

6. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; means carried by said arm for engagement in said cam notch; a pivoted lock cam; means connecting said reset arm and lock cam; a pivoted lock lever; means connecting said lock lever to a motor switch;-

a stud carried by said lock lever; a first latch pivotally mounted on said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; spring means connecting said first and second latches; and a detent stud carried by said second latch adapted to be engaged by said first latch to hold said second latch in unlatching position until said first latch has been tripped by said lock lever stud; whereby movement of said lock lever stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

7. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; a stud carried by said lock lever; a first latch pivotally mounted on said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; and spring means connecting said first and second latches; whereby movement of said lock lever stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

8. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a spring connected to said reset arm and continually stressing said arm in a direction of rotation opposite to the direction of rotation in which said setback shaft and cam are turned manually to effect resetting to zero of said registering mechanism; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; a stud carried by said lock lever; a first latch pivotally mounted on said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; and spring means connecting said first and second latches; whereby movement of said lock lever stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

9. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the peripherythereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; a stud carried by said lock lever; a first latch pivotally mounted on-said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; spring means connecting said first and second latches; and a detent stud carried by said second latch adapted to be engaged by said first latch to hold said second latch inunlatching position until said first latch has been tripped by said lock lever stud; whereby movement of said lock lever stud into the path of travel of said lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

10. In interlock mechanism for registering mechanism, the combination with a cam, having a notch in the periphery thereof, in integral relation with the registering mechanism setback shaft; of a pivoted reset arm; a spring connected to said reset arm and continually stressing said arm in a direction of rotation opposite to the direction of rotation in which said setback shaft and cam are turned manually to effect resetting to Zero of said registering mechanism; a roller carried by said arm for engagement in said cam notch; a pivoted lock cam; a link connecting said reset arm and lock cam; a lock lever pivotally mounted on said setback shaft; means connecting said lock lever to a motor switch; a studcarried by said lock lever; a first latch pivotally mounted on said lock cam; a second pivotally mounted latch having a series of notches adapted to selectively engage said lock lever stud; spring means connecting said first and second latches; and a detent stud carrried by said second latch adapted to be engaged by said first latch to hold said second latch in unlatching position until said first latch has been tripped by said lock lever stud; whereby movement of said lock lever stud into the path of travel ofsaid lock cam prevents movement of said setback shaft when said lock lever is in motor switch on position and trips said latches; and movement of said second latch and lock cam into the path of travel of said lock lever stud prevents movement of said lock lever to motor switch on position until said register mechanism has been set back to zero.

JOSEPH C. WOODFORD. JOSEPH E. FERNLY. 

